Water-soluble azo dyestuffs containing cationic groups by coupling diazonium nitrophenyl compounds with homophthalimides

ABSTRACT

1. A WATER SOLUBLE AZO DYESTUFF FREE FROM SULPHONIC AID OR FROM CARBOXYLIC ACID GROUPS AND HAVING THE FORMULA   1-(O=),2-R,3-(HO-),4-(A-N=N-),R1-1,2-DIHYDROISOQUINOLINE   WHEREIN A IS ORTHO-NITROPHENYL OR ORTHONITROPHENYL SUBSTITUTED WITH A MEMBER OF THE GROUP CONSISTING OF NITRO, CHLORINE, BROMINE, METHYL, METHOXY, ACETYL ,CYANO, ETHYL SULPHONYL AND TRIFLUOROMETHYL, R1 IS HYDROGEN, NITRO, HYDROXY, MEHOXY, AMINO OR ACETAMIDO AND R IS A PROTONATED   -CH2-CH2-CH2-NH(+)(-CH3)2   PYRIDIN-1-YLIUM-CH2-CH2-   4-(H3C-)-PYRIDIN-1-YLIUM-CH2-CH2-   OR   -CH2-CH2-CH2-NH(+)(-CH3)2   OR EACH OF THE SAID GROUPS R BEING IN ASSOCIATION WITH AN ANION.

U.S. Cl. 260-155 2 Claims ABSTRACT F THE DISCLOSURE Water-soluble azo dyestuls free from sulphonic or carboXylic acid groups and containing one or more cationic R (I) wherein A is an aromatic radical, R1 is a hydrogen atom or substituent group and R is a hydrogen atom, or an optionally substituted amino, alkyl, aralkyl, alkenyl, cycloalkyl, aryl or heterocyclic radical. The dyestutfs are Valuable for the coloration of polymeric materials in the form of bers, lm, threads or tapes and particularly of polymeric materials consisting of polyesters, polyamides, cellulose esters or polymers or copolymers of acrylonitrile or dicyanoethylene. These dyestuifs give yellow to orange colorations with rapid dyeing properties and are distinguished on polyacrylonitrile modied to contain acidic groups by bright yellow shades having good wet and light fastness, buildup and exhaustion.

This invention relates to new water-soluble azo dyestuffs which are valuable for the coloration of polymeric materials in the form of libres, film, threads or tapes and particularly of polymeric materials consisting of polyesters, polyamides, cellulose esters or polymers or copolymers ot' acrylonitrile or dieyanoethylene.

According to the invention there are provided new water-soluble azo dyestuis free from sulphonic or carboxylic acid groups and containing one or more cationic groups and having the formula:

(I) wherein A is an aromatic radical, R1 is a hydrogen atom or substituent group and R is a hydrogen atom, or an optionally substituted amino, alkyl, aralkyl, alkenyl, cycloalkyl, aryl or heterocylic radical.

The azo dyestufs of the invention can exist in a number of tautomeric forms; for convenience the dyestuffs have only been formulated in one of these tautomeric forms, but it is to be understood that this specification United States Patent O lCe naphthylazo, acylamino, aryloxy, arylamino, carbamoyl;

sulphamyl, alkylsulphonyl, alkylmercapto, aralkylmercapto, dialkylamino and substituted derivatives of the foregoing, nitro, cyano, triuoromethyl and halogeno atoms.

A is preferably a radical of the benzene,- naphthalene or heterocyclic class, especially suitable substituents bephenylazo, 3 trimethylammoniumphenylazo, 4- pyridiniumacetylphenylazo, 4 v.pyridiniumacetylamino- Particularly valuable dyestuffs, especially in regard to wet and light fastness, are obtained when A is an optionally substituted aromatic radical, especially a phenyl radical but which may be another aromatic carbocylic radical or aromatic heterocyclic radical, having a nitro group in the ortho position to the azo linkage.

The radical may contain a cationic group as for example in phenyl radical, Py for the pyridinium radical, CyPh for the cyclohexyl radical, M for the quinolium radical.

Xi-I stands for the l-methyl-B-pyridinium radical.

lil-V stands for 4-N,N-dimethylaminopyridinium radical. l stands for the Z-methylpyridinium radical.

CI- stands for the 4-methylpyridinium radical.

As examples of groups which may be represented by R there are mentioned alkyl groups such as methyl, ethyl, propyl, substituted alkyl groups such as -hydroxyethyl,

-ethoxyethyl,

-aminoethyl,

ly-dimethylaminopropyl,

,f1-pyridinium ethyl,

- ot-methylpyridinium) ethyl, acetylaminoethyl,

y-methoxypropyl,

amino `groups and substituted amino groups such as -N(CH3)2, NH-Ph, and 1'-methylpyridinium-3'-carbonylamino, aralkyl groups such as benzyl and p-methoxybenzyl, cycloalkyl groups such as cyclohexyl, Z-methylcyclohexyl and 2-methylpentyl, aryl groups such as phenyl,

4-methoxyphenyl,

2, 3- and 4-methylphenyl,

4-aminophenyl,

4nitrophenyl,

2, 3- and 4-chlorophenyl,

4acetylaminophenyl,

4-w-pyridiniumacetylaminophenyl,

4- [-pyridiniumethylaminosulphonyl phenyl,

4- [-pyridiniumethylaminosulphonyl] -2-chlorophenyl,

4- -pyridiumethyloxycarbonyl] phenyl,

3- -pyridiniumethylaminosulphonyl] phenyl,

S-trimethylammoniumphenyl,

2-chloro-5trimethylarnmoniumphenyl,

3- [2'rnethylpyridiniumethyl] 4-methylphenyl,

3-pyridiniumethy1-4-methylphenyl,

3-pyridiniummethyl-4-methoxyphenyl,

4-w-trimethylammoniumacetylphenyl,

3-quinoliniummethyl-4-methoxyphenyl,

3N,N,N,N-tetramethylisothiuroniummethyl-4- methylphenyl,

l-naphthyl,

3- 1 '-methylpyridiniurn4'carbonylamino) phenyl,

4( l '-methylpyridinium-3'-carbonylamino) phenyl, and

4 and heterocyclic groups such as l, 3, S-triazol-Z-yl and thiazol-2-yl.

As examples of groups which may be represented by R1 there are mentioned alkyl groups such as methyl and ethyl, substituted alkyl groups such as chloromethyl and pyridinium methyl, hydroxy, alkoxy such as methoxy, and nitro, amino and substituted amino such as alkylamino, acetamido, and pyridiniumacetamido.

As examples of cationic groups there are mentioned quaternary ammonium, cyclammonium, hydrazinium, sulphonium, isothiouronium groups, etherified hydroxylammonium, and phosphonium groups which will be associated with an anion.

As quaternary ammonium groups there are meant groups of the formula R3R4R5 wherein R3, R4 and R5 each represent a hydrogen atom or, preferably, an alkyl or cycloalkyl group or substituted derivative thereof. As alkyl or substituted alkyl groups which may be represented by R3, R1 and R5 there may be mentioned for example particularly methyl, but also ethyl, ,B-hydroxyethyl and benzyl.

As cyclammonium groups there are meant heterocyclic systems containing in the ring a quaternised nitrogen atom through which the ring is preferably but not necessarily attached to the remainder of the molecule. As examples of such groups there are mentioned N-alkyl such as N-methylpiperidinium and N-methylmorpholinium, and, particularly, aromatic heterocyclic systems such as pyridinium, quinolinium and isoquinolinium.

The heterocyclic groups may if desired be attached through a carbon atom of the heterocyclic ring as for example an N-methylpyridinium group attached through the 4-position. These heterocyclic systems may be optionally substituted by for example alkyl groups and may contain hetero-atoms additional to the quaternised nitrogen atom.

As sulphonium groups there are meant groups of the formula wherein R0 stands for an alkyl or substituted alkyl radical such as methyl or ethyl, R'1 stands for an alkyl or substituted alkyl radical such as methyl, ethyl and -hydroxyethyl, a cycloalkyl radical such as cyclohexyl, an aralkyl radical such as benzyl or an aryl radical such as phenyl and p-tolyl.

As isothiouronium groups there are meant groups which in one of their resonating forms may be represented by the formula NRSR \NRioRn wherein R0, R9, R10 and R11 represent hydrogen atoms or hydrocarbon or substituted hydrocarbon radicals 0r R8 and R10 may together form an alkylene radical.

As examples of hydrocarbon and substituted hydrocarbon radicals which may be represented by R8, R0, R10 and R11 there may be mentioned alkyl radicals such as methyl and ethyl, substituted alkyl radicals such as ,l-hydroxyethyl, cycloalkyl radicals such as cyclohexyl, aralkyl radicals such as benzyl and aryl radicals such as phenyl and p-tolyl. As an example of an alkylene radical which may be formed by R8 and R10 together there may be mentioned ethylene. In this case an imidazoline ring is formed.

As hydrazinium groups there are meant groups of the formula wherein R12 represents an optionally substituted alkyl, cycloalkyl, aralkyl, cycloalkyl, aralkyl or phenyl radical` or together with R13 and the adjacent nitrogen atom a heterocyclic system.

R13 represents an optionally substituted alkyl, cycloalkyl, aralkyl or phenyl radical or together with R12 and the adjacent nitrogen atom a heterocyclic system.

R14 represents a hydrogen atom or an optionally substituted alkyl radical or an acyl radical which may form a ring with R15 and N or when R12 and R13 are other than a phenyl radical.

R15 represents a hydrogen atom or an optionally substituted alkyl radical or an acyl radical.

As phosphonium groups there are meant groups of the formula Ris wherein R16' R17 and R18 are organic radicals, which may be the same or different, each having a carbon atom linked directly to the phosphorus atom. As examples of organic radicals which be represented by R16, R17 and R18 there may be mentioned aliphatic radicals for example methyl, ethyl, propyl, butyl, allyl, chloromethyl, hydroxymethyl and -hydroxyethyl, aromatic radicals for example phenyl, naphthyl, p-tolyl, p-chlorophenyl, aralkyl radicals for example benzyl and heterocyclic radicals for example 2- thienyl.

The cationic group or groups may Ibe contained in a radical A or a group R or R1 or may be attached directly to the benzene ring fused with the hydroxy-pyridone ring. The cationic group may for example be attached directly or through a group such as -X1-(A1)n to an aromatic nucleus wherein n=0 or l, X1 is a linking group such as -CO-, -NH-, SO2-j CO-Q O -NH-CH=, -CO-NH-CH2, -CH=N-,

-C2H4-, CI-I2, -CH2-, -CH2-NH-CO-, -S- and A1 is an alkylene or substituted alkylene group.

As anions associated with the cationic group there may be mentioned for example inorganic anions such as chloride, bromide, iodide, tetrachlorozincate, bisulphate, acetate or sulphate, sulphamate, phosphate, borate, or organic anions such as methosulphate, methylsulphate, and p-tolylsulphonate. Inthose cases Where the anion is polyvalent the Watersoluble dyestuffs will contain a corresponding molar proportion of the cationic part of the dyestuff.

According to a further feature of the invention there is provided a process for the manufacture of the azo dyestuffs of the invention which comprises diazotising an amine of the formula A-NHZ and coupling the resulting diazo compound with a coupling component of the formula:

wherein A, R, and R1 have the meanings stated hereinbefore, either the amine and/or the coupling component carrying as substituent at least one cationic group as hereinbefore defined'.

` The diazotisation and coupling stages of this process can be carried out in conventional manner for example by mixing a solution of the diazotised amine, obtained in a knownmanner, with an aqueous solution of the coupling component which has been dissolved in water by the addition of sodium carbonate, sodium bicarbonate, sodium hydroxide or preferably sodium acetate.

Arnines of the formula A*NH2 which do not contain a cationic group and may be used in the process of the invention include aniline, o, mor p-toluidine,

0,- mor p-anisidine,

0, mor p-chloroaniline,

o, mor p-nitroaniline,

2,5-dichloroaniline,

2,4-dinitroaniline,

2,4-dinitro-6-(chloro or bromo)aniline,

4-methanesulphonylaniline,

4-aminobenzotrifluoride,

4- or 5-nitro-2-toluidine,

4- or 5-nitro-2-anisidine,

4- or 5-chloro-2-anisidine,

4- or S-bromo-Z-anisidine,

2,4,6-trinitroaniline,

2,4-dinitro-6-carbomethoxyaniline,

2-amino-5-nitrobenzotrifluoride,

2,4-bis (methanesulphonyl) aniline,

2- (chloroor bromo-)4nitroaniline,

methylanthranilate,

4- or 5-nitromethylanthranilate,

4-aminobenzamide,

2,6di(chloro or bromo-)aniline-4-sulphonamide,

2,6-di(chloro or bromo-)-4-methylsulphonylaniline,

2,5-di-(chloroor bromo)-4,6dinitroaniline,

2-amino-3,5-di-nitrobenzotriuoride,

3-amino-4- (chloro-or bromo-) -2,6dinitro (toluene or anisole),

2- or 4-cyanoaniline, 4-nitro-2cyanoaniline,

2,4-dinitro-6-cyanoaniline,

2-nitro-4-cyanoaniline,

2-chlor0-4-cyanoaniline,

2-(chloroor bromo-)-4-methylsulphonylaniline,

3- chloroor bromo)-4-thiocyanatoaniline,

2( chloroor bromo) -4-sulphamylaniline,

2-amino-5-nitrophenylmethanesulphone,

2-amino-3,5-dinitrophenylmethylsulphone,

2-amino-3-(chloroor bromo-)5 nitrophenylmethylsulphone,

2-methylsulphamyl-4nitroaniline,

2-ethylsulphamyl-4-nitroaniline,

2-butylsulphamyl-4-nitroaniline,

2-dimethylsulphamyl-4-nitroaniline,

2-methylsulphamyl-4,6-dinitroaniline,

Z-methylsulphamyl-4-nitro-6-(chloroor bromo-)ani1ine,

Z-phenylsulphamyl-4-nitroaniline,

methyl 2-amino-3-(chloroor bromo)5-nitrobenzoate,

dimethyl Z-aminoterephthalate,

dimethyl 2-amino-5-nitroterephthalate,

aniline 2, 3- or 4-sulphamate,

Z-aminobenzamide,

4-aminobenzenesulphonamide,

2-nitro-4-methylaniline,

2-nitro-4-chloroaniline,

2-cyano-4-methylaniline,

4-chloro-2-methylaniline,

1-methyl-3-nitro-2-aminoiminazole,

Z-aminothiazole,

Z-amino-6-methoxybenzthiazole,

2-amino6methylsulphonyl benzthiazole,

2amino-6-nitrobenzthiazole,

Z-aminobenzthiazole,

2,5-dimethoxyaniline,

Z-amino-S-nitrothiazole,

7 2amino4 m-nitrophenyl-S-nitrothiazole, 3-metyhl-4-nitro-5-aminoisothiazole, 3-methoxy-5-amino-1,2,4-thidiazole, 3methylsulphonyl-S-amino-1,2,4-thiadiazole, S-methylmercapto--amino-1,2,4-thiadiazole, 3phenyl5aminol,2,4-thiadiazole,Z-amino-1,3,4-

thiadiazole, 3-phenyl-5-amino-1,2,4-thiadiazole, 2-amino-l,3,4thiadiazole, 2-amino-5-nitro-1,3,4-thiadiazole, 4-aminobenzene(2,5- or 3,5-dichloro)benzenesulphon- N,Ndimethylamide, 4-amino-3-chlorobenzenesulphon-N,Ndimethylamide, 5chloro2,4-bis(N,N-dimethylaminosulphonyl)aniline, 2-chloro-5-cyanoaniline, 2-cyano-5-chloroaniline, 2,4-dicyanoaniline, 4-aminodiphenylamine, 4aminodiphenylmethane, 4aminodiphenylsulphone, 4-aminoazobenzene, 4-phenylazo-1-aminonaphthalene,2-

aminobenzenesulphon-N,Ndimethylamide, Z-triuoromethylaniline, 2- or 4-aminobenzonitrile, Z-aminophenylmethyl or ethylsulphone and 4-chloro-2-triuoromethylaniline.

Amines of the formula A-NH2 which contain a cationic group and may be used in the process of the invention include (4-amino-phenylsulphonylamino)ethylpyridinium chloride, (4-amino-3-chlorophenylsulphonylamino)ethylpyridinium chloride, (4-amino-2,5dichlorophenylsulphonylamino) ethylpyridinium chloride, 4-amino-3,5-dichlorophenylsulphonylamino) ethylpyridinium chloride, 4-aminophenacyltrimethylammonium chloride, 3-amino-4-methylphenacyl) -trimethylammonium chloride, (4-amino-2-chlorophenacyl)-trimethylammonium chloride (4-amino-2,S-dmethylphenacyl)ammonium chloride, (3-amino-4-methoxyphenacyl) -trimethylammonium chloride, (4-aminophenylaminocarbonyl)methylpyridinium chloride, (4-aminophenylsulphonylaminoethyl) trimethylammonium chloride, N1-4-aminophenylcarbonylmethyl-N,N

dimethylhydrazinium chloride, 4aminophenyloxyethylcarbonyloxy-ethylpyridinium chloride, maminophenyl-trimethylammonium chloride, 3- 4aminoben2oylamino phenyltrimethylammonium chloride, 3(4-aminophenylsulphonylamino phenyltrimethylammonium chloride, 4-amino-phenylcarbonyloxyethyl-trimethyl-ammonium chloride, 4aminophenylmethyltrimethylammonium chloride, 3-aminophenyl-methyltrimethylammonium chloride, 3-aminophenyl-methylpyridinium chloride, (3aminophenylsulphonylamino)ethylpyridinium chloride, 3-aminophenacyl-trimethylammonium chloride, 3-aminophenyl-methylpyridinium chloride, 3-aminophenylaminocarbonyl-methyl-pyridinium chloride, 3aminophenylsulphonylaminoethyl-trimethylammonium chloride, N'-3-aminophenylsulphonylaminoethyl-N,N

dimethylhydrazinium chloride,

8 N-3-aminophenacyl-N,N-di-methylhydrazinium chloride, 3-aminophenyl-methyl-trimethylammonium chloride, N-3-aminophenylmethylN,N-dimethylhydrazinium chloride, 3aminophenylaminocarbonylmethyl trimethylammonium chloride, N3-aminophenylaminocarbonylmethyl-N,N-dimethylhydrazinium chloride, (4-aminophenylsulphonylamino -ethyl-2-methylpyridinium chloride, 4-aminophenylaminocarbonylmethyl-diethylsulphonium chloride, 4-aminophenyloxyethyl methyl-ethylsulphonium chloride, 4-aminophenylthioethyl-trimethylammonium chloride, 4-aminophenacyl-isothiouronium chloride, 3-(-4-aminophenoxyethylcarbonyl)-1-methylpyridinium chloride, N4-aminophenylcarbonylmethylidine-N,N,N-

trimethylhydrazinum chloride, 4-amino-3-nitrophenyltrimethylammonium chloride, 3-amino-4-nitrophenyltrimethylammonium chloride, lB-(4amino3-nitrophenylsulphonylamino) ethylpyridinium chloride, and 1,2-dimethyl-4-amino--chlorobenzimdazolium chloride.

As examples of coupling components there are mentioned Z-ethylisoquinoline-1,3-diol, isoquinoline-l,3diol, 2-fy-dimethylaminopropylisoquinoline-1,3-dio1 hydrochloride, Z--pyridiniumethylisoquinoline-1,3-diol chloride, 2-2methylpyridiniumethylisoquinoline-1,3-diol chloride, Z--hydroxyethylisoquinoline-1,3-diol, Z--acetylaminoethylisoquinoline-1,3-di01, 2-phenyl isoquinoline-l,3-diol, 2-4-methylphenylisoquinoline-1,3-diol, 2- [4 -pyridiniumethylaminosulphonyl phenyl] isoquinoline1,3diol chloride, 2-aminoisoquinoline-1,3-diol, 2-phenylarninoisoquinoline-1 ,3-dio1, 2-3-chlorophenylisoquinoline-l,3-diol, 2,3'-trimethylammoniumphenylisoquinoline-1,3-dio1 chloride, and 2-[3'-trimethylammonium-6chlorophenyl]isoquinoline- 1,3-diol chloride.

There is also provided an alternative process for the manufacture of the azo dyestuifs of the invention which comprises reacting a compound having the formula I wherein A, R and R1 have the meanings given hereinbefore and containing an anion forming group with a compound capable of alkylation to give a cationic group.

As examples of anion forming groups represented by Q there are mentioned especially chlorine, bromine and iodine atoms, and sulphato groups. In the reaction this group is converted into the anion.

As examples of compounds capable of alkylation to give a cationic group there are mentioned tertiary amines, hydrazines, thioureas, isothioureas, and phosphines such as trimethylamine, triethanolamine, pyridine, tetramethylthiourea, thiodiglycol, phenyl dimethyl phosphine, tri-nbutylphosphine, thiourea, ethylene thiourea, triphenylphosphine, picoline and dimethylaminopyridine.

The alternative process of the invention may conveniently be carried out by heating the compound containing an anion-forming group with a compound capable of alkylation either alone, or, preferably, in a solvent such as acetone, methanol, dioxan or water, dimethylformamide or acetic acid.

A particular example of this alternative process of the invention may conveniently be carried out by chloromethylating an azo dye derived from a water-insoluble amine and a homophthalimide, and reacting the resulting azo dyestuff (containing one or more CHzCl substituents) with a quaternisable compound.

Such a chloromethylation may be conveniently carried outby reactingA a water-soluble azo dyestui of the type herein disclosed with formaldehyde/chlorosulphonic acid at V-50" C. in concentrated sulphuric acid for a period of l-48 hours, or by reacting the dye in sulphuric acid 1 0 EXAMPLE 1 3.28 parts of -(4-aminophenylsulphonylamino)ethyl pyridinium chloride is dissolved in a mixture of 50 parts of water and 2.5 parts of 10N hydrochloric acid, and

5 o with formaldehyde/sodium chloride. Other chloromethyllitrttao 5 C' Wlth the addmon of 2N aqueous anon teehmques may also be used' After removal of excess nitrous acid from the diazo Another alternative method of obtaining dYeStuifS of compound with the addition of a small amount of V20% the invention is by alkylation of a dyeetuff ef formele I aqueous sulphamic acid, the diazo mixture is added at wherein A R .alle R1- have the meanings gwen herem` 10 5-10 C. to a solution of 1.98 parts of 2-ethyl isoquino eefore eind eonteming a group or atom capable of alkyle" line-1,3-diol in 75 parts of water containing 5 parts of non to gw? acatome greup' 2N aqueous sodium hydroxide and 4.5 parts of sodium Alkylatlng agent? which may ee used Include hahees acetate. The ,dyestulf is filtered off, washed successively such as methyl iodide, ethylbromide, cyclohexyl chloride with brine and 21/2% brine and vacuumdried at and benzyl bromide,v sulphates such as dimethyl, diethyl, 40 50 C dieyclohexyl and benzylmethyl Sulphate and eryleulphonie When applied to polyacrylonitrile from neutral or weakaeld esters such ae methyl and benzyl p'toluene sul' ly acidic dyebaths, an attractive greenish-yellow shade Phonates' is produced.

Groups or atoms which are capable of elkylatloil may l part of the dyestuff prepared above is pasted with 1 be for example primary secondary or ternary ammo or part of 30% aqueous acetic acid and diluted with 200 alkylmereepto .greues' parts of hot Water. The solution is then raised to the boil The process of this alternative method of the invention and allowed to COOL 10 parts of the above dyestuf Solu may convemently be earned out by heatmg a mlxture of tion are added to a dye-bath containing 0.03 parts of acetic the azo compound inY a suitable solvent such as benzene, acid 0.1 part of Sodium acetate and 300 parts of Water chloroform, dioxan, toluene, nitrobenzene, chlorobenzene, Thetemperature of the `dybmh is raised to 70 and 5 acetone watergaeete acid or NN'dl'methyleormamlele parts of polyacrylonitrile fabric are added. The tempera- W1th the alkylatmg agent and preferably also with ,an aeld ture of the dyebath is then raised to 90 over 15 minutes, binding agent Asuch as magnesium oxide, calcium or held at 90 for 15 minutes, raised from '90 to 100 over sodium bicarbonate and stirring the mixture for example 10 minutes and held at the boil for 11/2 hou1.s The dyed for a Period of from 1 to 24 hours at a Suitable tempera 30 fabric is removed rinsed with cold water and dried. ture (fori example between 20 and 130 C. and especially EXAMPLE 2 between 75 and 130 C.), if necessary in a closed vessel l under pressure. The product being insoluble in inert or- BY replacmg the ,ethylfsoiumolmeil3"1101 m Example ganic solvents such as dioxan or chlorobenzene may conby l;68 Parts of lsoqumolme'ljdlolga dyesfu Weld' veniently be isolated by filtration and washing, or where mg a similar Shade 0n Polyacrylommle 1S Obtamed' the product is soluble in the solvent used, by dilution with EXAMPLE 3 Water and Subsequent Salting-Out- 1.38 parts of o-nitroaniline are suspended in 20 parts The dyeStuifS 0f the inventiOn are Valuable fOl their of water containing 3 parts of 35% hydrochloric acid, rapid dying properties and give yellow 0r Orange coloraand the `mixture stirred at 0-5 C. for 18 hours. A solutions in polymeric materia1S Particularly in the form 0f 40 tion of 0.7 parts of sodium nitrite in 5 parts of lWater istextile materiale' especiallythosp Containing polymers and then added. After removal of excess nitrite with a little copolymers 0f aCrylOIlitrile and 0f dicyanoethylene and 20% aqueous sulphamic acid, the diazo mixture is added Polyester-S, polyamides aud'ClllulOSe eSterS- The pOlYineliC to a Solution of 3.1 parts of 2-y-dimethylaminopropylisomaterialsfmay be modified, fOr eXample acid-modified quinoline1,3diol hydrochloride and 3 parts of sodium The dyeStuffSOf the invention maybe applied t0 p0ly acetate in 50 parts of water at 0-5" C. The mixture is amide, cellulose ester, or particularly'polyacrylonitrile or stirred for 1 houiat 0 5 Q andthe predpitated dyepolydicyanoethylerle materials frOl'n acid, neutral 01 stuff ltered off, washed with a little cold water and dried. Slightly alkaline dybaths (i-e- PH from 3 t0 s) at tem- When applied to polyacrylonitrile fibres from neutral perature's between 40 and 120 C. and preferably between 50 0r weakly acidic dyebaths it yields attractive mid-yellow 80 and 120 C.I or by printing techniques using thickened shades with good fastness properties. print pastes. Y The Z-y-dimethylaminopropylisoquinoline-1,3-diol hy- Ori pnlyarylmiitrile textile materials, eSpftially When drochloride used above is prepared by heating a mixture the polyacrylonitrile has been modified to contain acidicl of 18 parts of homophthalic acid and 20.4 parts of fy-digroups, bright yellow shades are obtained which are dismethylaminopropylamine at 160 for 4 hours. Excess tirlguislled by thei'rgOOd Wet and light fastne'SS, build up amine and water are distilled off under a vacuum, and and exhaustion-properties. l the residue diluted with 80 parts of acetone. A current The dyestuls are particularly valuable for coloration, of dry hydrogen chloride gas is then passed intol the acepreferably from ueutral'dyebaths, 0f POIS/amide and polytone solution at room temperature for 15-20 minutes.v ester polymeric materials which are modified tocontain The precipitated product, a colourless crystalline solid, is acidic groupscollected, washed with acetone and vacuum dried' at room The invention is illustrated but not Ylimited by the foli temperature. i i lowing examples inwhichy all parts and percentages are Further examples of the invention are illustrated in by weight unless otherwise specified. the following table:

Coupling component Example -Diazo component R R i Shade 4 2-ehloro-4-'nitroaniline -CiH-HKHMCI- H Greeeliliishy ow. 5 .,.pNitiman-i1ine.4 ogni-feiirnionmor H Do.

6 i, I2-nitio-4-ch1oroaniline.. -CaHe-NIHCHMCI- H Yellow.

7 p-Tolllidine C3H-NH(CH3)2C1' H Do.

8 2-nitro-4-methoxyaniline '-C3He-NH(CH3)2C1 H Orange.

TABLE-Continued Coupling component Example Diazo component R R 1 Shade 9 2-ethylsulphonyl-i-methoxyaniline C3H6NH(CH3)2C1 H Yellow. 10 4-(3.t rirncthylammoniumphenylazo)-3-methyl- Ethyl H Reddisharulme. yellow. 11 z-nitmA-mechylamune -caHG-NHHmcl- H Yellow.

2-11itro-6-methylaniline C3Hu-NH(CH3)2C1 H Do.

2nitro5-triiuoron1ethylaniline. -C3H-NH(CH3)2C1 H Do.

14 2-nitro-4-sulphon-N-ethylamidoaniline. -C3H-NH(CH3)2C1 H Do.

15 2-11tro-6-chloroaniline. -C3Hr-NH(CH3)2Cl-.. Do.

16 Z-nitro-l-acetylaniline.... -CgHa-NH(CH3)2C1. Do.

17 2-nitro-5-chloroauiline -C3H-NH(CH3)2C1. Do.

18 2-nitro4-br0maoaniline -CaHe-NHHmCl' D0.v

19 2-nitro4-dodecylaniline -CaHu-NHHmCl- H.. Do.

20 2-nitro-4-trifluoromethylaniline -CgHs-NEKCHQZCI- H Do.

21 2nitro5-bromoaniliue -C3H5-NH(CH3)2C1 H Do.

22 2-nitro-4,-dichloroaniline -C3H6-NH(CH3)2C1 H Do.

23 2-nitro-4-butylar1iline -C3H@NH(CH3)2C1 H Do.

24 2carbomethoxy-E-chloroauiline C3HG-NH(CH3)2C1 H Greeiishye ow. 25 2-carboxnethoXyaniliue -C3H-NH(CH3)ZC1 H Do.

26 2cyano5-methylaniline -C3H6-NH(CH3)2C1 H Do.

21 z-eyanoaniline -CQHPNHI-ozor H Do.

28....` 2,4-dinitroaniline -C3H-NH(CH3)2C1 H Yellow.

30 2,4linitro-G-bromoaniline -C3HNH(CH3)2C1 H Do.

31 2,4-dinitro-6-carboxymethylaniline -C3He-NH(CH3)2C1 H Do.

32 2,5-dichloro-4,6dinitroaniline -C3H-NH(CH;)2C1 H Do.

33 2,5-dibromo-4,-dinitroaniline -C5H-NH(CH3)2C1 H Do.

34 2,4-dinltroochloro-methylaniline C3H-NH(CH3)2C1 H.. y Do.

35 2,4-dinitro6bromo-3-methoxyani1ine -C3H6-NH(CH3)2C1" H Do.

36 2,4-dinitro-6cyanoanilne -C3H-NH(CH3)2Cl H Do.

37 2-ntro-4-cyanoaniline -C3H-NH(CH3)2C1 H Do.

38 3-ami11o-2,4,6-trinitrotolucne -C3H-NH(CH3)2C1 H... i Do.

39 2-arnino-B,5-dintrophenylmethylsulphone -C3H-NH(CH3)2C1 -'H Do.

40 4-arnino-3-nitrophenyl-trimethylammonium H H v D0.

chloride.

41 do D0. do... Do. .do. Do. do. ,Do.

45 -(4-aminO-S-mtrophenylsulphonylamno)ethyl- Do.

pyridinium chloride.

Do. Do.

48 -(4-amino-S-nitrophenylsulphonylamxno)ethyl- Do.

pyridinium chloride. -1

49 1-(4-aminophenacy1)-2-methylpyridinium chloride..- H H Greeush- 50 1(4-aminophenacyl)quinolinium chloride... H..-. H l Do.

51 1-[-(4-aminophenysulphonylamino)ethyl]4 H H Do.

methylpyridinium chloride. 52 -(fi-aminophenylsulphonyl-amino)ethyltrimethyl- H H Do.

, ammonium chloride.

53 3-aminophenyltrlmethylphosphonium chloride H H Do.v

54 4aminophenoxyethyldimethylmethoxyammonium H H D ptoluenesulphonate.

55 N--(4-amino-3-chlorophenylsulphonylamino) ethyl-N,N-dimethylhydrazinium chloride. 56 N-3-aminophenylsulphonylaminoethyl-NN- hydrazinium chloride. 57 (li-aminophenoxyethyl)-cthylmethylsulphonium chloride. 58 4-aminophenacylisothiouronium chloride; 59 (li-aminophenylcarbamoylmethyl)-diethylsulphonium chloride. 60 1-[-(4-aminO-S-nitrophenylsulphonylamino)ethyl]- 4-N,N-dimethylaminopyridnium chloride. 4-amino-3nitrophenyltrimethylanunonium chloride do Do. -..do domi- 7-methoxy.. Do. -C3H-NH(CH3)2C1 7-hydroxy Do.

-CsH-NHHhCl do Do.

-oa-Nmcmnor do D0.

-CaH-NHHmclv-nitro D0.

68. 4-aminO-S-nitrophenyltrime Do.

69. do.' Do.

o-Nitroauilino D0.

TABLE- Continued n A, y y Coupling component xample i DiaZo componenty .f 1 R r R, Shade 71 2nitro4methylaniline do H Yellow. 72.. o-Nitroaiuline -Hydroxy--pyridiniumethyl H Do. 73 do `-4methylpyridiniumethyl H Do. 74 2-njtro-4-chloroaniline o. H Do. 75 4-amino-3-nitrophenyltrlrnethylamm Ethyl.. 7-acetamido Do. 76 o-Nitroaniline do 7-pyridiniumacetamido- Do.

EXAMPLE 77 Other dyestuis obtained by alkylating disperse azo- 3 parts of the dyestuff prepared as described in Examhomophthalmid? dyes are 'given below (R1 iS a hydrogen ple 3 are dissolved at 60 in 300 parts of water, and 2 atom in each case):

Example A R Alkylating agent Shade 80 o-Nitrophenyl -C3H-N(CH3)2 Propyl bromide Yellow. 81 do -C3H-N(CH3)2 Ethyleneehlorohydrin Do. -C3H-N(CH3)2 Methyl p-toluenesulphonate... Do. -C3H-N(C2H5)z; -Chloropropionitrlle. Do. -CaH-N(C2H5)z Dimethylsulphate D0. Ethyl do Greenish-yellow. 86 2-nitro4dimethylaminoethylaminosulphonyl do .do Yellow.

parts of sodium bicarbonate added, precipitating the free We claim: base of the dyestuff. This is filtered oil, washed with water 40 1. A water soluble azo dyestuff free from sulphonlc acld and dried. or from carboxylic acid groups and having the formula 1.1 parts of the dye free base thus obtained and 0.23 parts of magnesium oxide are suspended in 25 parts of chlorobenzene. '0.54 parts of dimethyl sulphate are added, and the mixture is heated at 130 for 30 minutes. After 45 cooling, 1.4 parts; of a dyestuif of formula I wherein A R1 is an o-nitrophenyl radical, R is i A-N=N -o3H-1i`r(CH3)3cH3s o.-

50 HO /-O and R1 is a hydrogen atom are precipitated. The dyestuff N is filtered or" and dried. R

When applied to polyacrylonitrile from neutral 0r weakly acidic dyebaths, a mid-yellow shade with excellent wet andlght faSDeSS PmPefieSS Obtained 55 wherein A is ortho-nitrophenyl or orthonitrophenyl sub?.

' stituted wtih a member of the group consisting of nitr'r; EXAMPLE 78 chlorine, 'bromine, methyl, methoxy, acetyl,l cyano, ethyl lphonyl and triuoromethyl R1 is hydrogen nitro hy- By replacing the 1.1 parts of the dye base employed 1n su Example 70 by 1.35 parts of the dye base prepared from 60 droxylllnetllox; arfnmo olr acetamdo and RIS a Protonated the dyestuff described in Example 11, a yellow dyestuff group avmg 9 ormu a somewhat redder in shade than that described in Example 23 is obtained. onlcmcm-mcnm EXAMPLE 79 4 65 -crncm-N/Q By replacing the 0.53 parts of dimethylsulphate used in Example 70 `by a corresponding amount of benzyl chloride, a dyestuff of the formula 'l wherein A is an o-nitro- CH,CH, CHa phenyl radical, R is C3H-(CH3 2-CH2P11 cx- 70 of and R1 is hydrogen is obtained. -CHrCHrCHa-wlm.

When applied to polyacrylonitrile from a neutral or weakly acidic dyebath, a mid-yellow shade with rgood each of the said groups R being in association with an wet and light fastness properties is obtained. l5 anion.

15 16 2. A water-soluble azo dyestu as claimed in claim 1 1,087,427 2/ 1914 Blank et al. 260-156 whereinA is ortho nitro phenyl. i 2,099,525 11/ 1937 Krzikalla et al. 260-156 X 3,518,247 6/1970 Altermatt et a1 260-156 References Cited 3,538,074 11/1970 Hegar 260-156 D UNITE STATES PATENTS 5 FLOYD D. HIGEL, Primary Examiner 2,965,631 '12/ 1960 Sartori 260-155 y 1,893,646 1/1933 Holzach et al. 260-155 X U S C1, XR,

lifgg EDIIE' 26022461? 26o-286 Q, 289 QP, 294.8 R, 296 R, 306.7, 301.7, 562 3,117,959 1/1964 Dehrrert 26o-155 10 R5695675M 

1. A WATER SOLUBLE AZO DYESTUFF FREE FROM SULPHONIC AID OR FROM CARBOXYLIC ACID GROUPS AND HAVING THE FORMULA 